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The dynamic response analysis of a pyroelectric thin-film infrared sensor with thermal isolation improvement structure

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10 Author(s)
Jyh-Jier Ho ; Dept. of Electron. Eng., Fortune Inst. of Technol., Kaohsiung, Taiwan ; Y. K. Fang ; W. J. Lee ; F. Y. Chen
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Both theoretical and experimental studies of the substrate effect on the thermal behavior of a PbTiO3 infrared (IR) sensor have been reported. With active cantilever dimensions of 200×100×5 μm3 formed by etching processes, the pyroelectric micro-electro-mechanical system (pyro/MEMS) structure exhibits a much superior performance to that of a traditional IR-sensing bulk structure under the 800-μW incident optical light with wavelength of 970 nm. Two-order improvement in current responsivity is obtained for the pyro/MEMS structure. This shows the substrate effect on the performance of a pyro/MEMS IR sensor is very significant. A simple model has also been proposed to illustrate the substrate effect more comprehensively

Published in:

IEEE Transactions on Electron Devices  (Volume:46 ,  Issue: 12 )